Blind-fastener.

(Application filed Dec. 3, 1900.)

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THE NORAIS PETERS CO.. PHOTO-LITHC.. WASHINGTON. D. C.

United States Patent Office.

JOHN DAVIES, OF ST. LOUIS, MISSOURI.

BLIND-FASTENER.

SPECIFICATION forming part of Letters Patent No. 684,497, dated October 15, 1901.

Application filed December 3i 1900. Serial No, 38,423. (No model.)

To all whom it may concern;

Beitknownthatl, John Davies, of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Blind-Fasteners, of which the following is a full, clear,and exact description, reference being had to the accqmpanyingdrawings, forming a part hereof.

This invention relates to blind-fasteners; and it consists of the novel construction, combination, and arrangement of parts hereinafter shown, described, and claimed.

The-object of this invention is to provide an improved fastener for blinds which is so constructed that it can only be detached from the inside whenever it is desired to open the blinds and is provided with a locking-wedge adapted to be held in place by the windowsash.

Figure 1 is a perspective view showing my improved blind-fastener in position for use. Fig. 2 is a sectional view of a socket constituting a part of my invention. Fig. 3 is a side elevation showing that portion of the fastener which is carried by the blind. Fig. 4 is a horizontal sectional view of a socket which is carried by the Window-casing. Fig. 5 is a top view, with parts shown in section, of that part of the fastener which is carried by the blind. Fig. 6 is a view showing the fastener in actual use.

In the construction of my improved blindfastener I provide a socket 1, adapted to be secured to the blind and to project at a right angle therefrom. The outer ends of the fasteners 2 are located within the socket 1 and are retained therein by means of the pin 3. The arrangement of the socket 1 and the fasteners 2 is such that the fasteners may have a certain lateral movement, but are prevented from vertical movement on account of their edges being close against the interior of the socket 1. This allows for the operation of the fasteners in order to engage them with the other member, which is carried by the window-casing, and also prevents their forward ends from moving to a position out of alinement with the said member.

Intermediate of the ends of the fasteners 2 is a pin 4, one end of which is located within an opening in one of the members 2, wherein it is retained by means of a pin 5. The op posite end of the pin 4 projects through an opening in the other member 2 and carries on its outer extremity a pin 6, adapted to con- 55 tact with the member 2 to prevent the said pin 4 from being moved out of the opening in which it is located. A spring 7 encircles that portion of the pin 4 between the members 2 and serves to press apart the said members 2 6s in order to cause them to better engage with that member of the latch which is carried by the window-casing.

indicates suitable push-knobs carried bj^rthe fasteners 2, whereby they may be easily (5 pressed together in opposition to the spring 7 in order to free them from engagement with the second member of the fastener whenever it is desired to open the blinds.

Rigid with the projecting ends of the mem- 70 bers 2 are shoulders 9, the outer sides of which are beveled, as shown in Fig. 5. The function of the shoulders 9 is to engage with the member of the fastener which is carried by the window-casing. 75 denotes a socket adapted to be secured to the window-casing in alinement with the fasteners 2, and the outer end of said socket 10 is provided with the internal flanges 11, one on each side of the said socket. A suit- 80 able connection 12 has one end secured to the socket 10 and carries on its opposite end a wedge or other separating device 13, the function of which is to engage between the inner ends of the fasteners 2 when they are within 85 the socket 10 and to press them apart, as shown in Fig. 6, to cause the shoulders 9 to engage against the flanges 11.

In operation the socket 1 is secured to the blind, as stated, and the socket 10 is secured 96 to the window-casing in alinement with the said socket 1 and the fasteners 2, carried thereby. The spring 7 normally holds the fasteners 2 separated from each other, as shown in Fig. 5,buttheir ends, being beveled, 95 will pass within the socket 10 whenever the blind is closed. When the blind is entirely closed, the shoulders 9 are entirely within the socket 10, and the said shoulders engage directly against the flanges 11 in the manner 100 shown in Fig. 6. The wedge or separator 13 is then passed between the ends of the fas* teners 2 to prevent the said fasteners from being pressed together to release them from

684,497 their engagement in order to open the blind. The device 13 is preferably of such length that when the window is lowered its rear end is in contact with the window-sash, thereby 5 absolutely prohibiting its removal except by raising the window, and since windows are usually provided with fasteners to hold them in position it follows that the blind-fastener cannot possibly be released except from the io inside.